Underreamer



Aug. 27, 1935. E ROE 2,012,774

UNDERREAMER Filed March 25, 1935 m Mm@ y the vupper endsofsaidcutte'rs*` are 'adaptedjt'o 1 ulorumrrwherebylthe'lowerends of'the cutters "Laxman fico Cai.

lower end of the casing and the reamer is re- CiprOCated,` the cuttingedges I8 are projected into operative engagement with the wall of thehole. The cutters remain'in the position, shown ini Fig. 2, during theinitial VVreaming operation,

and as the well'hole is enlarged the cuttersare gardually canted to keepthe cutting edge in en-f lg'agementwith the wallof the hole and when thebeveled. portion|6 of the faces-|4 contactwith the faceilof .theshoulder 8,'the cuttersride-up the Ashoulders and move to fully expandedposition, as shown in Fig. 3. f f

In operation, when the vcutters are lowered ,b'e-v yon'd the `end of thewell casing 28, thesprin'g tension on the cross bar 20 willcausertheutters to bel rocked on their fulcrums I1,` soa.sto asA sumethe positio1frs.hownin4 Eig. 2. 4In thisr'vrposition, the beveled edgesI6 'ofthe'cutters abut.'A againstthe shoulder 8 and Vthe cuttingsedges l11-, are projected into operative cutting engagement with the walls ofthe'holetobe reame'diUpon man1 ,operationefgthe moi `the waiis of the"noie prevent the cutters-f from-movingto"fully"ex banded position',but` as-the diameter Io'fthehole increasesthebeveled edges IQride-uptheoblique shoulders 8,` until'they farei free'f to Inovefto nor'- malVoperativepositon, as shown in Fig 3:" It 'is only proposed that theoutters remain-inthe position shown'in Eig. 2 during theinitial opera'-tion of the reamefwhichper'xnits.the hole'tob l reamed withoutA rstraisi'ngrthev well casing. Itis to be understood'that th'e form ofmylin-V vention herewith shown andv described VVis 'tobe takenasapreferred'example of the same'and thatcertain changes inA the shape,size .andar-1 rangement "ot the partsmay be made withoutdepartingqfr'onfi thespirit'of the Ainvention'.V orthev .Having thusdescribed myV-invention, Icl'aim:- `i0- 1.- In an'expansible-underreamer, the combina'-V tion of areanier'body havinglongitudinal ways',

means slidably a'nd rockablyf'- mountingcutters 'inv` the ways y'of*saidl bodylqmeans 'form'oving said cutters `upwardly in the-w'a'y'sfa'nd f means vintermediate `niej'lenga-1@of ngewaysfroeausing'fthe lower ends" .of the cuttersto be A*swung outwardlyinto expanded operative position` 2.v In anexpansibleiunderrearner, the:combina-- tionoiA aA reamerfbody havingilongitudinal: ways,

means slidablyfand'rockably mounting cutters in the waysof'saidfbodygflfileans"for' moving said cutters-upwardly inthe ways and`abutme'nts in;- i

termediateV the length of th' eway'skr against which swung }'outwarcilyVyinto-fQlerative' position, said cutters being adapted toride over .saidabutr'nents and moveupwardlyinto the sockets after initialoperationofthereanierf" 1 T4. In an expansible underreamer,thefc-'ombinal tion ofV afreanfier body'havingilongitudinal Waysprovided with'fsocketsat theirlpper ends, means slidably and rockablymounting 'cuttersdi"V the ways of saidlbod'y, yieldable meansffor movingexpansible un'derreamer, 4the combina'- said cutters upwardly in theways. and means intermediatethe length of said ways for mo- Y mentarilyarresting the upward movement of said cutters and cause the lower endsof the cutf ters to swing-outwardly into expanded operative position.

5. In :anexpansible underreamer, the combination of a reamer body havinglongitudinal waysgcuttersmovable in' the ways, a cross bar slidably; androckably mounting said cutters in the ways and means in the ways of saidbody `againstwhich theupper ends of said cutters are "adapted'to fulcrumwhereby'the lower ends of l vthe'cutters are swung outwardly intoexpanded operative position. .5

6. -Inan expansible underreamer, the combina-V tionfof a reamerbodyhaving longitudinal ways,

a shoulder formed in the base of each of said ways, Vcutters slidablyand rockably mounted in lsaid ways and adapted to have their upper endsabuty against said shoulders vand means for moving saidcutters upwardly;in saidways against saidV Vshoulders,-'th"e upper? ends `of`saidgcuttersbeing adaptedl to fulcrum ag'ainstcsaid shoulders to swing. the lowercuttingVA edges :outwardly intoV expanded operative position. y 1 7.1Inan expansibleunderreamer, the. comfbination of a reamer-bod'yl-ihavinglongitudinal ways, .cutters-islidably. androckablymounted in said ways, and-means formed in the base of said ways againstwhich Athe upper ends `oisaidA cutters are adapted to fulcrum whenlmovedupwardly in said ways, wherebythe lower cutting edges position.r

are, swung outwardly. intoV expanded operative l."8`... In V anexpansible `underreamer, Vthe combination lof. a .reamer bodyhavinglongitudinal Y ways, cutters-slidably 'and rockably. fmounted in saidways, means formed in the, base of said ways against whichtheupperendsof saidcutters are "adapted `to .fulcrum and' meansbfor moving saidcuttersupvadly in saidways into fulcrumed enj-v gagefrnentwithsaidfnrst. ,mentioned means, nwhereby the" lower ends ofsaid cutters areswung outwardlyintp expandedv operative position.,.

"..j9`. In/anmexpansible 'underreamen Vthe combination of a reamer bodylhaving longitudinal ways, said ways 1havingthe upper portionof vtheirbaseoii-set outwardly from 'the'lower portionvand connected by. adownwardly jand inwardly` inclined shoulder, and means slidably androckably mountingcutters inA said ways, the

top innerjedges ,of said cutters being adapted Y thelowerends of thevcutters arev swung outward- -ly'into :expanded operative'position.

V1 (4). In an underreamerfthe combination of a reamer bodyhaving"longitudinal ways, abutments formedin the base of said ways'intermediate their Vlengthffcutters movable in said 1 Y waysfa 'crossbar extending through openings in,

'said' cutters' Vslidably andfrockably4 mounting said .cutters in Ysaidways,` and meansexerting an up- -ward pulll onsaid cross bar to Vmovesaidcutters ru'pwardlyinY said-ways,V the inner upper edge of saidcutters 'being a'dapted'to fulcrum against 'said7"abutment's,'toinitially 'expad'the' lower nends` *of* the cutters' to" operative"position, before movingto' the upper ends of said ways. r

Vv"111. In'an expansible' underreamen' the com` binatiqnifof areame'ibpdy having longitudinal ways, the bottom" of said' waysintermediate their length being Vp1'ovide-d'with transverse shoulders,

cutters vslidably androckablyfmountedin said ways, Vthe inner top edgesof said-cutters 4being j adapted to fulcrum against saidy shoulders andmeans for exerting an upward tension on said cutters, whereby thecutters are rocked on their fulcrums to swing the lower cutting edges ofsaid cutters to an expanded operative position.

12. In an expansible underreamer, the combin-V ation of a rearner bodyhaving longitudinal ways,

vsaid ways having the upper portion of their base oi-set outwardly fromthe lower portion and consaid ways,'intermediate their length, cuttersvslid- 'ably and rockably mountedin said ways, theup* 13. In anexpansible underreamer; the .conlbinationof a reamerrbody havingVlongitudinal Vways, oblique shouldersk formed in the base .of

per face of said cutters vhaving inner beveled edges, a cross barextending Vthrough openings in said cutters havingthe outer ends of itsupper Y edge in Contact with'the'top of the openings adjacent the outerface of said cutters,`and tensioning means for exerting `anupw'ard pullonlsaid cross bar whereby` the inner Y,edge of theftop faces of Ythecutters "are caused' to fulcrum against said shoulders, whereby thelower jends of the cutters are swung outwardly to expanded operativeposition. Y

Y ROE.

